There have been many posts on the subject.
Generally speaking it is fairly easy to do. You do not mention which HTT you have. I suspect you have an older HTT, pre-2011(??), as that is about when they seamed to switch most to dual 20# tanks, except maybe the 17Z, which has a low CCC. So make sure to watch your tongue weight, as most of the new weight being added, will be distributed towards the tongue.
You can do it like TaftCoach did, or you can remove the regulator and install a new auto switching regulator, and a new tray. Make surer to use gas (Yellow) Teflon tape on the new threads, and check for leaks (I like kid's bubble solution).
It is an easy swap.
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